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Here is a structured exam-ready summary of Cytology Lecture 1 - Introduction & Chemistry (Geomedi, 2026 - Dr. Giorgi Berishvili):

Cytology L1: Introduction & Chemistry - Exam Summary

1. Cell Theory & Introduction

Cytology (cell biology) = the study of cells
Four pillars of Cell Theory:
1. Cells are the fundamental units of life
2. All living organisms are made of cells
3. The smallest life forms are solitary cells
4. Cells arise from pre-existing cells
Cells vary in size (5-100 µm), form, and function but share similar basic chemistry and compartments
All cells evolved from a common ancestor

2. Prokaryotes vs. Eukaryotes

Feature	Prokaryotes	Eukaryotes
Origin	~3.5-4 billion years ago	~1.5-2 billion years ago
Nucleus	Absent	Present (membrane-bound)
Organelles	Absent	Present (membrane-bound)
Size	Smaller	Larger
Reproduction	Faster	Slower

Eukaryotes arose via endosymbiosis
Mitochondria contain their own DNA and reproduce by dividing

3. Cells as Chemical Systems

Cells are the most chemically complex systems known
Chemistry is coordinated by large polymers
Cellular chemistry is tightly regulated - reactions occur at the proper rate, time, and place
Cells are ~70% water

4. Essential Elements of Life

C, H, N, O = 96.5% of an organism's weight
Only electrons undergo rearrangements in chemical reactions
Atoms interact to fill their outermost electron shells (by losing, gaining, or sharing electrons)

5. Types of Chemical Bonds

Covalent Bonds (Strong)

Formed by sharing outer-shell electron pairs
Polar covalent bond = unequal sharing of electrons
Carbon forms single, double, and triple bonds
Double bonds are more rigid than single bonds
Bond angles and lengths determine 3D geometry of organic molecules

Weak (Noncovalent) Bonds - less than 1/20 the strength of a covalent bond

Bond/Force	Mechanism
Hydrogen bond	H atom "sandwiched" between two electronegative atoms (O or N)
Ionic bond (electrostatic)	Gain and loss of electrons; strong without water, weak in water
Van der Waals attraction	Weak attraction due to fluctuating electrical charges at very short distances
Hydrophobic force	NOT a bond; nonpolar surfaces pushed out of hydrogen-bonded water network

Key point: Weak interactions are critical for macromolecular structure (e.g., hemoglobin)

6. Water as a Solvent

Cells are 70% water
H and O have very different electronegativities → water is highly polar → forms hydrogen bonds
Water dissolves salts by hydrating their ions (dissociation → cations Na⁺ and anions Cl⁻)
Nonpolar (hydrophobic) compounds dissolve poorly in water

7. Four Major Families of Organic Molecules

A) Sugars (Carbohydrates)

Formula: (CH₂O)n
Monosaccharides = simplest sugars (e.g., glucose - central energy source)
Monosaccharides linked by glycosidic bonds
Disaccharides (e.g., sucrose = glucose + fructose)
Oligosaccharides = 2-10 sugar units; can contain non-repetitive sequences
Polysaccharides = long chains; most abundant organic molecule on Earth = cellulose (plant cell walls, made of glucose)

B) Fatty Acids

Two distinct regions:
1. Long hydrocarbon chain - hydrophobic, chemically unreactive
2. Carboxyl group (-COOH) - hydrophilic, chemically reactive, ionized (-COO⁻) in aqueous solution
Serve as concentrated energy reserves - produce ~6x more energy per gram than glucose
Fatty acid chains are components of cell membranes

C) Amino Acids

Subunits of proteins
Each has: amino group (-NH₂), carboxyl group (-COOH), and a side chain (R) attached to the α-carbon
The R group (side chain) distinguishes one amino acid from another

D) Nucleotides

Subunits of DNA and RNA
Structure: nitrogen-containing base + 5-carbon sugar + one or more phosphate groups
Pyrimidines (6-membered ring): Cytosine (C), Thymine (T), Uracil (U)
Purines (6+5 membered fused ring): Guanine (G), Adenine (A)

8. Macromolecules

Macromolecules = polymers of small organic molecules (monomers) linked by covalent bonds
Four types in cells: polysaccharides, proteins, nucleic acids, lipids

Formation & Breakdown

Condensation = adding monomers to one end of a chain (builds polymer, releases water)
Hydrolysis = breakdown of polymer (adds water)

Key Bonds in Macromolecules

Macromolecule	Bond
Proteins	Peptide bond (between amino acids)
Nucleic acids	Phosphodiester bond (between nucleotides)
Polysaccharides	Glycosidic bond (between monosaccharides)

Peptide Bonds (Proteins)

Links adjacent amino acids → forms a polypeptide
Formed by condensation reactions
Chain has N-terminus (NH₂) and C-terminus (COOH)
No rotation around the C-N bond

Nucleic Acids (DNA & RNA)

DNA = double-stranded, stable helix, long-term genetic repository
RNA = single-stranded, more transient carrier of molecular instructions
Sequence of nucleotides encodes genetic information
Noncovalent interactions stabilize RNA conformation

9. Macromolecular Assemblies

Covalent bonds allow small molecules → macromolecules
Noncovalent bonds allow macromolecules → large multisubunit complexes
Example: hemoglobin structure stabilized by bound water molecules and weak interactions

Next Lecture (Preview)

Cell Membrane: Structure, fluid-mosaic model, types and functions of membrane proteins

References used in lecture: Alberts - Essential Cell Biology (5th ed.); Lehninger - Principles of Biochemistry (7th ed.); Junqueira's Basic Histology (16th ed.)

Give me MCQ type questions from this pdf

Here are 30 MCQ-type questions based on the Cytology Lecture 1 PDF, covering all major topics:

Cytology L1 - MCQ Practice Questions

Section 1: Cell Theory & Introduction

Q1. Which of the following is NOT a part of the Cell Theory?

A) Cells are the fundamental units of life
B) All living organisms are made of cells
C) Cells can arise spontaneously from non-living matter
D) Cells arise from pre-existing cells

✅ Answer: C - Cells do NOT arise spontaneously; they come from pre-existing cells.

Q2. The typical size range of cells is:

A) 1-10 nm
B) 5-100 µm
C) 1-5 mm
D) 100-500 µm

✅ Answer: B - Cells range from 5-100 µm in diameter.

Q3. Which statement is TRUE about all cells?

A) They all have a nucleus
B) They all have membrane-bound organelles
C) They all share similar basic chemistry
D) They all reproduce at the same rate

✅ Answer: C - All cells share similar basic chemistry regardless of their form and function.

Section 2: Prokaryotes vs. Eukaryotes

Q4. Eukaryotic cells appeared approximately:

A) 3.5-4 billion years ago
B) 1.5-2 billion years ago
C) 500 million years ago
D) 4.5 billion years ago

✅ Answer: B - Eukaryotes appeared ~1.5-2 billion years ago.

Q5. The theory that explains the origin of eukaryotic organelles from prokaryotes is called:

A) Cell theory
B) Endosymbiosis
C) Hydrolysis theory
D) Condensation theory

✅ Answer: B - Endosymbiosis explains the origin of mitochondria from ancient prokaryotes.

Q6. Which of the following is a feature EXCLUSIVE to eukaryotic cells?

A) Plasma membrane
B) DNA
C) Ribosomes
D) Membrane-bound nucleus

✅ Answer: D - Only eukaryotes have a membrane-bound nucleus.

Q7. Which organelle in eukaryotic cells contains its own DNA and reproduces by dividing?

A) Ribosome
B) Golgi apparatus
C) Mitochondria
D) Lysosome

✅ Answer: C - Mitochondria have their own DNA and divide independently.

Section 3: Chemical Bonds

Q8. Which elements make up 96.5% of an organism's weight?

A) C, H, O, P
B) C, H, N, O
C) C, N, S, P
D) H, O, Na, K

✅ Answer: B - Carbon, Hydrogen, Nitrogen, and Oxygen = 96.5%.

Q9. In living organisms, which part of an atom undergoes rearrangement during chemical reactions?

A) Protons
B) Neutrons
C) Electrons
D) The nucleus

✅ Answer: C - Only electrons undergo rearrangements.

Q10. The atomic number of an element is determined by its number of:

A) Neutrons
B) Electrons
C) Protons
D) Isotopes

✅ Answer: C - The number of protons determines the atomic number.

Q11. A covalent bond formed by UNEQUAL sharing of electrons is called:

A) Ionic bond
B) Hydrogen bond
C) Polar covalent bond
D) Van der Waals bond

✅ Answer: C - Unequal sharing produces a polar covalent bond.

Q12. Which type of bond is formed by the gain and loss of electrons?

A) Covalent bond
B) Hydrogen bond
C) Van der Waals attraction
D) Ionic bond

✅ Answer: D - Ionic bonds form by electron gain/loss.

Q13. Ionic bonds are described as:

A) Strong in water, weak without water
B) Strong without water, weak in water
C) Equally strong in all environments
D) Never found in living organisms

✅ Answer: B - Ionic bonds are very strong without water but weak in aqueous environments.

Q14. Hydrogen bonds form when a hydrogen atom is sandwiched between two:

A) Carbon atoms
B) Electron-attracting atoms (usually O or N)
C) Positively charged atoms
D) Nonpolar atoms

✅ Answer: B - H bonds form between H and electronegative atoms like O or N.

Q15. The Van der Waals attraction is best described as:

A) A strong bond between large molecules
B) A weak attraction between atoms due to fluctuating electrical charges at very short distances
C) A bond formed only in nonpolar molecules
D) A type of ionic interaction

✅ Answer: B - Van der Waals is a weak attraction from fluctuating charges at close range.

Q16. The hydrophobic force is:

A) A strong covalent bond
B) A type of hydrogen bond
C) Not a chemical bond - it results from pushing nonpolar surfaces out of the water network
D) An ionic interaction

✅ Answer: C - Hydrophobic force is NOT a bond; it is a physical exclusion effect.

Q17. Weak noncovalent bonds have approximately what fraction of the strength of a covalent bond?

A) 1/2
B) 1/5
C) Less than 1/20
D) 1/10

✅ Answer: C - Noncovalent bonds are less than 1/20 the strength of covalent bonds.

Section 4: Water & Cells

Q18. What percentage of a cell's composition is water?

A) 30%
B) 50%
C) 70%
D) 90%

✅ Answer: C - Cells are approximately 70% water.

Q19. Water is a highly polar molecule because:

A) It contains carbon atoms
B) H and O have very different electronegativities
C) It has a linear molecular shape
D) It cannot form hydrogen bonds

✅ Answer: B - The electronegativity difference between H and O makes water polar.

Q20. When salt dissolves in water, the positive ions formed are called:

A) Anions
B) Isotopes
C) Cations
D) Radicals

✅ Answer: C - Positive ions are cations; negative ions are anions.

Section 5: Organic Molecules & Macromolecules

Q21. The general formula for monosaccharides is:

A) (CH₃O)n
B) (CH₂O)n
C) (CHO₂)n
D) (C₂H₂O)n

✅ Answer: B - Monosaccharides follow the formula (CH₂O)n.

Q22. The most abundant organic molecule on Earth is:

A) Glucose
B) DNA
C) Cellulose
D) Collagen

✅ Answer: C - Cellulose (a polysaccharide of glucose in plant cell walls) is the most abundant.

Q23. Fatty acids serve as concentrated energy reserves and produce approximately how much more energy per gram than glucose?

A) 2 times
B) 4 times
C) 6 times
D) 10 times

✅ Answer: C - Fatty acids produce ~6 times more energy per gram than glucose.

Q24. What distinguishes one amino acid from another?

A) The amino group
B) The carboxyl group
C) The α-carbon
D) The side chain (R group)

✅ Answer: D - The R group (side chain) is unique to each amino acid.

Q25. Which of the following nucleotide bases are PURINES?

A) Cytosine and Thymine
B) Guanine and Adenine
C) Uracil and Cytosine
D) Thymine and Adenine

✅ Answer: B - Purines (double ring): Guanine (G) and Adenine (A).

Q26. Which bases are classified as PYRIMIDINES?

A) Adenine and Guanine
B) Cytosine, Thymine, and Uracil
C) Guanine and Uracil
D) Adenine and Cytosine

✅ Answer: B - Pyrimidines (single 6-membered ring): C, T, U.

Q27. Polymers are built from monomers by which type of reaction?

A) Hydrolysis
B) Oxidation
C) Condensation
D) Reduction

✅ Answer: C - Condensation reactions build polymers; hydrolysis breaks them down.

Q28. The covalent bond between two amino acids in a protein chain is called:

A) Glycosidic bond
B) Phosphodiester bond
C) Peptide bond
D) Hydrogen bond

✅ Answer: C - Peptide bonds link amino acids together.

Q29. Which end of a polypeptide chain has the amino (-NH₂) group?

A) C-terminus
B) N-terminus
C) Both ends
D) The middle of the chain

✅ Answer: B - The N-terminus has the free amino group; C-terminus has the carboxyl group.

Q30. In nucleic acids, nucleotide subunits are linked by:

A) Peptide bonds
B) Glycosidic bonds
C) Phosphodiester bonds
D) Hydrogen bonds

✅ Answer: C - Phosphodiester bonds link nucleotides in DNA and RNA.

Bonus - Conceptual Questions

Q31. Which role does DNA play compared to RNA?

A) DNA is transient; RNA is stable
B) DNA is a long-term genetic repository; RNA is a transient carrier of molecular instructions
C) Both play identical roles
D) DNA only exists in the nucleus; RNA does not

✅ Answer: B - DNA is stable long-term storage; RNA is transient messenger.

Q32. Large multisubunit complexes of macromolecules are held together primarily by:

A) Covalent bonds
B) Peptide bonds
C) Noncovalent bonds
D) Glycosidic bonds

✅ Answer: C - Macromolecular assemblies are stabilized by noncovalent bonds.

Tip for exam: Pay special attention to bond types (covalent vs. noncovalent), the 4 organic molecule families, and prokaryote vs. eukaryote differences - these are the most commonly tested areas from this lecture.

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